package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;


public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//        //获取session
//        HttpSession session = request.getSession();
        //通过请求头获取token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            return true;
        }
//        //从session获取用户
//        Object user = session.getAttribute("user");
        //通过token在redis获取用户
        String key=LOGIN_USER_KEY+token;
        Map<Object, Object> map = stringRedisTemplate.opsForHash().entries(key);
        //判断用户是否存在
//        if (user == null) {
//            //不存在则拦截，返回401未授权状态码
//            response.setStatus(401);
//            return false;
//        }
        if(map.isEmpty()){
            return true ;
        }
        //将查询到的hash信息转换为userdto对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(map, new UserDTO(), false);
        //存在保存到threadlocal
        UserHolder.saveUser((UserDTO) userDTO);
        //刷新token有效期
        stringRedisTemplate.expire(key,LOGIN_USER_TTL, TimeUnit.SECONDS);
        //放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //方法结束后，一定要手动清理
        UserHolder.removeUser();
    }
}
